/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.dao.upgrade;

import org.apache.dolphinscheduler.common.utils.FileUtils;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.ClassPathResource;

import com.google.common.base.Strings;

/**
 * Metadata related common classes
 */
public class SchemaUtils {
  private static final Logger logger = LoggerFactory.getLogger(SchemaUtils.class);

  private SchemaUtils() {
    throw new UnsupportedOperationException("Construct SchemaUtils");
  }

  public static List<String> getAllSchemaList() throws IOException {
    final File[] schemaDirArr = new ClassPathResource("sql/upgrade").getFile().listFiles();

    if (schemaDirArr == null || schemaDirArr.length == 0) {
      return Collections.emptyList();
    }

    return Arrays.stream(schemaDirArr).map(File::getName).sorted((o1, o2) -> {
      try {
        String version1 = o1.split("_")[0];
        String version2 = o2.split("_")[0];

        if (version1.equals(version2)) {
          return 0;
        }

        if (SchemaUtils.isAGreatVersion(version1, version2)) {
          return 1;
        }

        return -1;
      } catch (Exception e) {
        logger.error(e.getMessage(), e);
        throw new RuntimeException(e);
      }
    }).collect(Collectors.toList());
  }

  /**
   * Determine whether schemaVersion is higher than version
   *
   * @param schemaVersion schema version
   * @param version       version
   * @return Determine whether schemaVersion is higher than version
   */
  public static boolean isAGreatVersion(String schemaVersion, String version) {
    if (Strings.isNullOrEmpty(schemaVersion) || Strings.isNullOrEmpty(version)) {
      throw new RuntimeException("schemaVersion or version is empty");
    }

    String[] schemaVersionArr = schemaVersion.split("\\.");
    String[] versionArr = version.split("\\.");
    int arrLength = Math.min(schemaVersionArr.length, versionArr.length);
    for (int i = 0; i < arrLength; i++) {
      if (Integer.parseInt(schemaVersionArr[i]) > Integer.parseInt(versionArr[i])) {
        return true;
      } else if (Integer.parseInt(schemaVersionArr[i]) < Integer.parseInt(versionArr[i])) {
        return false;
      }
    }

    // If the version and schema version is the same from 0 up to the arrlength-1 element,whoever has a larger arrLength has a larger version number
    return schemaVersionArr.length > versionArr.length;
  }

  /**
   * Gets the current software version number of the system
   *
   * @return current software version
   */
  public static String getSoftVersion() throws IOException {
    final ClassPathResource softVersionFile = new ClassPathResource("sql/soft_version");
    String softVersion;
    try (InputStream inputStream = softVersionFile.getInputStream()) {
      softVersion = FileUtils.readFile2Str(inputStream);
      softVersion = Strings.nullToEmpty(softVersion).replaceAll("\\s+|\r|\n", "");
    } catch (FileNotFoundException e) {
      logger.error(e.getMessage(), e);
      throw new RuntimeException("Failed to get the product version description file. The file could not be found", e);
    }
    return softVersion;
  }

}
